If it was a light frost, probably OK to leave it. It will start to grow again and metabolize the nitrates. If it is a harder frost it is usually best to get it cut ASAP. Generally if it is standing in water it will have greater frost tolerance/protection so you might wind up patchwork quilt cutting it.
For sure get a nitrate test in addition to regular feed testing.
For sure get a nitrate test in addition to regular feed testing.
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